Typewriting machine



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In ren for Patented Novi 6, 1928. i i l i y UNITED STATES PATENT oFFlcE.

ALFRED G. F. kURowsxI, oF BROOKLYN, NEW YORK, AssIGNoR 'ro UNnERWooD` ELLIOTTl FISHER COMPANY, oF NEW YORK, N. Y., A coRPoRATIoN oF DELAWARE.

4'rYFEWRI'rINa MACHINE.

Application led June 21, 1924. Serial No. 721,398.

This invention relates to typewriting ma- Figure 3 illustrates an elevation of Figure chines, and is directed more lparticularly to 2, as viewed from the left-hand end thereof. line-space mechanism, line-space adjusting f' Figure 4 illustrates 'an end elevation of a 5 mechanism and platen-detent-release mechaline-space wheel, together with line-space 5 nism, y mechanism andline-space adjusting mecha-v The invention includes features of connism constructed and arranged in accordance struction such as enable the parts to be with the present invention. stamped from sheet-metal, to provide for a Figure 5 illustrates a fragmentary portion 60 light-Weight construction, combined with of- Figure-2,A as viewed from` the rearthe m simplicity, compactness and durability, and typewriter end frame being shown sectioned,

which features are especially suitable for vFigure illustrates the platen-detent-rctypewriting machines of the portable type. lease mechanism in an actuated position to Other features of the invention include an release the line-space ratchet-Wheel. 65 Vupright line-space-lever at the frontv of the Flgure 7 illustrates the line-space adjustcarriage and operable by a sweeping movelng. mechanism, certain other parts with ment of the hand in a carriage-return direc whlch it co-operates being shown in section. '.tion; a line-'space-pawl movable rearwardly ,Flgure 8 illustratesA a front elevational across the top of the ratchet-wheel to rotate VleW 0f the line-space adjusting mechanism, 70 the platen forwardly by a pulling movement together with a fragmentary portion ofthe a linesspace-pawl having a fixed initial stop platen-frame, in's'ection.

and movable from the fixed stop to an adf, AnaXle 1, to 'carry a revoluble platen 2, is justable stop for a single line-spacing unit of )Qurnaled in a platen endframe 3, and proi movement with means t0` Shift j the adjustvided with a linger-wheel 4 to effect rot-ation 75 able stop to increase the throw of the pawl 0f the platen.

fromthe fixed stop, formultiples of a line- The lille-Spa@ -meChlIliSm includes L lille .space unit; a means to convey motion from Space lever 5, having alaterally-proj'ecting a line-.space-lever to ka line-spacing mechafinger-P160@ 5,5 and Ily be ill the fOlmN 0f a nisrn through a plane at right angles to the bell-,Crank conveniently positione'din'an up- 8e movable plane 0f Sdid lever by a, Singlg link SlIlCllIlgOI' Vel'tlCtl plane lO falliltl@ il-Ctllai :so having positive pivotal connections to both; tlonthereof bya Sweeping movement Ofthe a, Spring having dil-ect Conngction t() the 111411, C-I'Illge-ICUID dlleCllOIl. The

pawl and operative to restore the whole line-` level" 5 .1S PIVOllly SuppOreCl 0n a yhorizon- Spacing mechanism t0 normal positions; a, lavllhdlSPOSedishouldered SCIGW 6 threaded `85 means forming a part 0f the adjustable Stop lIlLO 21,11 6211 7 `WhlCll OIIHS an integral. parl',

t0 interlock with a part of the pawl, 1,30 pre; of the left-hand end frame 3.; lThe line-.space vent independent rotation of the platen at the leVel 5 v`1S T OCkGQl in a CTGCOU, indicated by end of al lne spalcing movelnent: and a, con` the LITOV 1I] BHgllI'ev gftojeffect fl, El-lllllld densed arrangement of the line-spacingYmOveHleIlt Ofl a line-Space pawl in a plane 9o mechanism for a portablevmachine to been-' at right angles to the plane of movement of closed Within a carrying 'Case with none-0f the*line-space-lever 5, through the intermedi;A the opera-tivefparts thereof projecting above ary 0f a kwel' 9 0f the fst odef'ld il hDl-. the outline of the carriage-ends.' A l0. Thevlink `l() is substantially L shaped,

Other features and advantages will here; with its short arm -fulcruined at onthe' 9?" v Y. inafter appear. .A shorty arm of the bell-crank lever 5, and its In the accompanying drawings,- long arm havinga ear 12 bent at right angles Figure l illustrates a top plan -vieW of a lto vfulcrum at 13l on the short arm" of the' platen for a portable typewriting machine, lever 9. 4 A f' 1 L Y together with the line-spacing mechanisms The lever 9 ,takes a` vfulcrum upon the l constructed and arranged in accordance with platen-axle 1, and theline-space pawl 8 is the present invention; Y i Y fulcr'umed at 14, to the free end thereof. The` l Figure 2 illustrates, in frontelevation, a line-Space pa-wl 8 kmay bepro-videdwith a* fragmentary left-hand portion of Figure 1.. teeth 1-5v co-"operateI with' lirelspacelv ratchet-wheel 16, secured to the end of the platen 2, to effect line-space movements of the platen whenthe line-space leve-r is actuated. A relatively long-range rocking movement ot the line-space lever 5 impart-s a substantially straight-line or .vertical movement to the link 10, which movement rocks the lever 9 and the pawl 8. A return-spring 17 tor the whole line-spacing mechanism is-connected at one of its ends to a stud 18 on the left-hand. end frame 3,' its other end being secured to a stud or pin 19 which projects laterally from an ear 20, that forms a part of a strip 21 brazed or otherwise suitably `secured' to the outer face ofthe pawl 8, sai-d ear depending from the pawl and over the `tace ot' the ratchetswheell, to position the stud 19 to be housed within thecarriage-end 3. LA stud 52 is fixed on the left-hand end 'frame 3 at a point to promote a` camming action by co-acting with `the pin 19, and in this manner the pawl S', just prior to reaching its limit ot return movement, is. raised out ot co-'operaf tive relation'with the ratchet-wheel byheing rocked on its pivot 14, so that the tooth thereof just clears the teeth of the line-space ratchet-wheel, as illustrated in `Figure Y4. The left-hand endirame 3 is provided with an ear 22, engaged hytheline-space lever 5 to limit the return movement thereof, by the spring 17.

The line-space movement of the line-space lever may be adjusted to ei'lfect multiples of j a single linespace unit of movement for the plat-en by means of the line-space adjusting mechanism, which, as a unit, is designatedj23, see Figure 7. This mechanism includes three members designated 24, 25, and 29, all of which Vmay be stamped from sheet-metal and united to form a substantially V-shaped unit. These members taken separately include a stop-arm 24 provided with a hooked 'end 26, and a. hub portion 27.V The member 25 is made of spring steel, and is provided with a Yhub port-ion 28, to be united with the hub 27' by means of rivet-s. A metal strip 29 is rigidly secured to the upper end of the member 25 by means of a linger-button 30, the shank portion 31 of which prot-rudes through a slot 32 in the end trame 3 and unites the member 25 to the strip 29.V The strip 29 is provided with a. pin 33 to engage within one' of a` series ot holes 311 inthe end frame 3, to retain the hooked arm 24 in its adjusted positions. rlfhe line-space adjusting mechanism just described as a unit, is pivotally supported on the platen-axle 1, and may be set to various positionsV to limit the line-spacemovement ot' the pawl 8. By pressing inwardly on the linger-button until a col-lar 35 strikes the tace of the trame 3, the member 25 yields'in a manner to disengage the pin 33 from whichever hole 34 it may he engaged with, thenlthe unit 23 is rocked on its' pivot until the'pin233 is in alignment with the desired hole 3ft, and then, by releasing the linger-button, the spring steel member 25 becomes eelt-restoring to move the pin 33 into engagementwith the desired hole and thereby lock and maintain the line-space adjusting mechanism in adjusted position. i

The line-space lever 5 may now be actuated to effect a vline-space movement, the initial rearward movement ot' the line-space pawl 8 causing the pin 19 on the line-space pawl to ride ott of the stud 22, and by the action oi the spring 27 the tooth 15 engages a tooth in the line-sp`ace wheel 16.

Further actuation of the line-space pawl 8 will eiiect a single or double line-space movement of the platen, according to the adjustment of the stop-arm 2e and which arm arrests the movement of said line-space pawl by engaging the pin 19, as illustrated in dotand-dash linesV in Figure 4." Thus by varying the position of the stop-arm 24; relatively to the pin 19, by the plugging-in action oi' the inger-button 30, the range et movement of the line-space pawl 8 is'predetermined for either a single or a double line-spacing distance. Ot course it will be understood that a third hole 3st may be provided, so that the lherein-described line-space adjusting mecha@ nisin may be adjusted to effect a triplevlinespacing movement, it desired.

The platen-detent-release mechanism includes a detent-lever designated 36, stamped 'from sheet-metal, and formed into a bellcrank with arms 37and 38, offset from `each other and connected vsubstantially at the pivotal point, by a web 39 which is substantially U-shaped, as viewed from the rear in Figure 5. The Vlever is pivotally supported by a screw 4.0, with the upstanding arm 38 aligned' with the inner wall of the end iframe, and with the arm 37 carrying` at its lower end a detent or roll L11 to co-operate with the teeth et the line-space wheel 1G. A coil-spring l2, having its ends-connected to a roll-supporting stud A3 and tev a stud lll secured to the end frame 3, acts tourgc the detent or roll @t1 into engagement with the line-space wheel, as'indicated in Figure 3. A detent-release leve-r designatedfl is pivotally supported tor rocking movement on a shouldered stud 4G. A stud 4T, carried at the upj er end of the lever 1-5, protrudes through a slot- 48 in the end frame 3, and'is provided with aY finger-knob 49. At the pyotalsupport for said lever, a slot 53 is provided, open at one end to, fa-

cilitate placement of the lever 45 on its supporting stud 46.

n To move the detent-release lever 15 to aposition to withdraw the roll L11 to an ineii'ective position, as illustrated in Figure 6, a `cam-tace 50 is provided on the lever 115, which, when rocked in a clockwise direction from its normal inoperative position, as indicated in dottedlines'in Figure 3,

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to an actuated position, as illustrated in Figure 6, causes the cam to co-act with the arm 38, to rock the detent-lever 36 and disengage the roll 41 from the ratchet-wheel to permit the platen to be revolved freely in either direction by the finger-wheel 4. It will be particularly noted that the high part of the cam face 50,

vwhen in the detent-releasing position of Figthe dead-center or interlocking position, the

action of the spring 42in restoring the detent-roll 41, converts the rounded end of thel arm 38 into a cam to restore said detent-release lever to normal or inoperative position, the slot 48 in the platen-frame co-acting with the shank portion of the finger-knob 49, to limit movement of saidA lever to both normal and actuated positions. The inertia of the heavy platen tends to overthrow its line-r spaced position at the end of a line-spacing operation, and, while the spring-detentroll will act to justifythe position of the platen, it is an advantage to positively lockV some operating part, to prevent an independent movement of the platen. As already described, the stop-arm 24 has formed thereon a hook 26, and when thel line-space pawl 8 is shifted to the dot-and-dash position ot Figure 4, the stud V19 is arrested by the arm 24, and said studA has also passed under thev hook 26, and any tendency of a tooth of the ratchet-wheel 16 to cam by the tooth 15 of the pawl will be checked by said hooi; holding the tooth 15 locked .between adf joining teeth of the ratchet-wheel, and will effectively prevent an independent rotation of the `platen in either directionat the end of a line-spacing movement.

f lt will be noted that when the line-spacing parts are at their normal positions,as at Figure 4, the a-Xis 14 of the pawl 8 and the two studs 19 and 18 practically'intersect a straight line drawn through them, and the actionvof the 4spring 17 upon the pawl 8 holds the pawl in a state of equipoise. Hence, the same spring that has sufficient. power to restore therv y replacef IVhen the de-.

1. Ina typewriting machine having a platen and a platen-axle, the combination with a line-spacing mechanism to drive the platen, including a toothed ratchet-wheel, a

.line-space pawl, vand a line-space lever, of a lever of the firstorder fulcrumed upon the platen-axle, one arm thereotl connected to the line-space pawland the other arm thereof connected to be operated by the line-spare lever forwardly of the platen-axle. Y

2. In a typewriting machine, the combination with a revoluble platen having an axle, of a line-space ratchetwheel to drive the platen, a line-space pawl, a lever having an arm extending rearwardly of the platen-axle and connected to the pawl, said lever being pivotally supported on said platen-axle, a line-space finger-lever operatively connected forwardly of the platen-axle to the other arm of said first-named lever to effect line-space movement of the ratchet-wheel, anda stop to arrest the line-space movement of said .fingerlever, the range of movement of said lingerlever being varied rin accordance with the adjustmenteof said stop to predetermine a line-space movement for the platen.

"3. In a typewriting machine, the combination with a revoluble platen having an axle, of a line-space ratchet-wheel, a line-space pawl, alever connected to said pawl, a linespace bell-crank lever having a finger-piece and being pivotally supported in an upstanding or vertical plane on a horizontal pivot below the axis of saidrplaten axle, a link connecting said levers whereby actuation of said bell-crank lever effects line-space movement of said ratclietwvlieel, and a stop mounted upon the platen-axlev to arrest the first-named lever, to determine aline-spacing swing'for the bell-crank lever.`

4.. In a typewriting machine, the combina ICO tion with a revoluble platen having an axle, f

and mounted in a platen-frame, Vof a linespace ratchenwheel, a line-space pawl to cooperateV with said wheel, and means toactuate said pawl to effect line-space movement ofsaid ratchet-wheel, including a lever of the first order pivot-ally supported on the axle of said platen to connect at one end to said pawl, a line-space bell-crank lever supported at the front of the platen lupon a pivot in a plane below and at right angles to the axis of said platen, and a linlr connecting said bell- Vcrank lever to the opposite end of said lever of the lirstorder, whereby the direction of movement of said link will be reversed for the line-space pawl, said line-space lever havinga finger-piece .extending from said pivot to apoint substantially Hush with the top of the platen-frame. .Y Y

5. In a typewriting machine, the combination with a revoluble platen and a carriageframe end, of a linespace ratchet-wheel, a line-space pawl having an ear depending therefrom to overhang the tace of the ratchetu'heel, a stud projecting laterally from said ear to be housed Within the carriage-end, and means fined Within the carriage-end to coact with said stud to camthe paWl out of cooperative rela-tion With said ratchet-Wheel when said paWl moves to itsreturn position.

(S. In a typewriting machine, the combination with a revoluble platen anda carriagerame end, of a line-space ratchet-Wheeh'a pivoted line-space paWl having v'a tooth to engage the ratchet-Wheel and an ear depending therefrom over the side ot the ratchet-Wheel, a paul-stud projecting laterally from said ear below the position ott the tooth to be housed within the carriage-end, a stud Within thecarriage-end coacting With said paivlstud to cam the pawl out of co-operative relation with said ratchet-Wheel when said pavvl returns to normal position, and a spring secured tothe paul to jointly restore said pawl and oppose the camming ol' the pawl over the stud, the spring-anchors'and paWl-pivot being substantially in a straight line when said pawl is in normal position to reduce they spring-tension necessary to etlect camming ot thepawl.

7. InV a typeWriting machine, the combination with a revoluble platen, of an end frame therefor, a line-space ratchet-Wheel, a linespace pawl comprising a tooth to cooperate with the ratchet-Wheel and having a depending ear, said tooth co-operating with the ratchet-Wheel to effect line-space movement thereof, a pin projecting` laterally from said ear, belov7 said tooth and in vertical alignment therewith, a stud secured to said enc frame, to co-operate With said pin to cam said tooth from operative engagement with Vsaid 'atchet-Wheel When Asaid paWl is moved to return position, an additional stud secured to said end trame, and a spring connecting said pin with the latter named stud to ellect movement ot said paWl to return-position.

8. In a typeuf'riting machine, the combination With a revoluble platen, of a line-space ratchet-Wheel, a line-space paWl, plural memtolimit the range of movement ot said pawlA` and means fornjring a part of said stop, to locli the pawvl in engagement with the ratchetwheel at the end of a line-space movement of the platen.

9. In a typeivi'iting machine, the combinatic-n with a revoluble platen, of a line-space ratchet-Wheel, a line-space patri to engagev said ratchet-Wheel, cammina' members, one

' et which is movable with said paivl, to cam said paal out ot engagement vwith said ratchet-Wheel vfhen the paul is moved to return position, a stop adjustable circumferentially ol said Wheel and settable to vone pawlcamming member to limit the range of movement of the pawl and thereby determine a line-space movement for said platen, and means settable with the stop and operative at the end of a line-space movement to prevent displacement ot' the pawl from the ratchet-wheel by interlocking with the lastk named camming member.

10. In a typewriting machine, the combination with a' revoluble platen, of a line-space ratchet-Wheel, a line-space pawl comprising a tooth and a laterally proj ectingl pin, means to cooperate with said pin to cam said paWl out ot co-operative relation with said ratchetwheel When moved to return posit-ion, and means adjustable to vary the range ot' the forward movement ot said pawl, including a stop-arm having a hooked end to both intercept and lock the pin, to prevent the displacement of the pawl by the ratchet-wheel.

ll. In a typewriting machine, the combi-r nation with a platen revoluble upon a platenaXle, of a line-space ratchet-Wheel, a linespace paWl having a tooth to engage said ratchet-Wheel, a pin projecting laterally from said paivl, and a stop-arm pivotally mounted upon the platen-axle to intercept the movement of said pin to stop said pawl at the end of a line-spacing movement, said stop-arm having means to interlock with said pin to prevent displacement of the pawl by the inertia ot the platen.

l2. In af typewriting machine, the combination with a revoluble platen havingV auv axle, of a line-space ratchet-Wheel, a linespace pawl having` a tooth to engage said ratchet-uf'heel, a pin projectinglaterally from said paWl, a. stop-arm pivotally mounted upon the platen-axle to intercept and lock said pin to stop said paw] at the end ofa linespacing movement, and means to adjust said stop-arm to vary the range of movement oii said paWl to predetermine the extent of movenient tor said platen.

13. ln a typeuriting machine, the combination with a platen revoluble upon a platenaxle, ot a line-space ratchet-wheel, a linespace paWl engaging said ratchet-Wheel and eifecting line-space movement thereof, and means controlling the line-space movement oli' said paWl by varying` its range of movement, said means including a stop-arm and a spring-pressed locking arm, both arms pivotally mounted upon the platen-axle, said spring-arm being operative to lock the stoparm at predetermined Vstop positions.

l-l. A mechanism adjustable to control the line-f; ace movement of a line-space pawl, by varying its entire range of n'iovement in accordance with the desired number of linespace movements ot the platen, including a stop-arm and a stop-adjustingarm rigidly connected together and pivotally supported upon the axle o1e a typewriting machine, said adjustable arm yielding laterally under pressure to unlock said arm to permit adjustment or' the stop-arm, and being self-acting to efrect a. plugging-in operation to lock said stoparm in adjusted position.

15. A mechanism adjustable to control the line-space movement of a line-space pawl by varying its entire range of movement in accordance with vthe desired number Ofilinespace 'movements of the platen, comprising, in combination, three members united to form substantially a V, one of said members consisting of a hooked stop-arm having a hub by means of which the V is pivotally supported on the platen-axle of av typewriting machine, the second member consisting of a strip of spring steel having a hub at which point said strip and stop-arm are united, and

a nger-button having a shank, and the third member consisting of? a strip united to said second-named strip by said shan r and having a locking pin projecting laterally therefrom.

16. In a typewriting machine, the combination with a revoluble platen having an axle, of an end frame for said platen, a line-space ratchet-wheel, a line-space pawl to engage said ratchet-wheel to effect line-space movement thereof, a-nd mechanism adjustable to control the line-space movement of said linespace pawl, by varying its entire range of movement in accordance with the number of line-space movements of the platen, comprising a stop-arm pivotally supported on said platen axle, to limit movement of said pawl, a laterally yielding arm connected to said stop-arm and having va linger-button secured thereto, a slot in said end frame engageable by the sha-nk of said button, a strip united to said yielding arm by said shank and having a pin projecting laterally therefrom, and apertures in said end frame engageableby said pin to lock said stop-arm in adjusted position, said second-named arm yielding laterally by pressure on said linger-button to disengage said pin from an aperture to unlock said stop-arm and permit adjustment thereof. f v

v 17. Ina typewriting machine, the combination with a platen mounted in a carriageframe, a line-space ratchet-wheel revoluble upon the platen-axle, and a line-space pawl engageable'with said wheel, of a line-space lever pivoted below the platen-axle on an axis transverse to the platen and having a lingerpiece extending upward from the pivot to a point substantially flush with the top of the carriage-frame, and connections between said lever and said pawl to actuate the latter upon the sweep of the lever in a carriage-return direction.

18. In a typewriting machine, the combination with a revoluble platen mounted within a carriage-frame, of a line-space ratchetwheel secured to said platen, a pawl for actuating said wheel, a bell-crank line-space lever pivoted on a horizontal axis transverse to the aXis o' said platen and below the bottom of the platen, one arm of said lever serving asa finger-piece and extending to a point approximately'on a level with the top of the carriage-frame, and connections between said pawl and the other arm of said line-space lever to impart line-space rotation to said ratchet-wheel upon movement of said lingerpiece in a carriage-return direction.

ALFRED G. F. KUROIWzSKI. 

